Double-exposure and blank-film preventing device for cameras



H. J. FRIES. DOUBLE EXPOSURE AND BLANK FJLM PREVENTING DEVICE FORCAMERAS.

APPLICATION FILED JAN. '13, 1920.

Patented 1m 20, 1921.

8 Ma m w A TTORNEYS H. I. FRIES. DOUBLE EXPOSURE AND BLANK FILMPREVENTING DEVICE FOR CAMERAS.

APPLICATION FILED IAN. I3, I920.

1,400, 72, Patented Dec.20,1921.

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To all whom it may concern Be it known that I, HOWARD J. FRIES, acitizen of the United'States, and a resident of Tacoma, in the county ofPierce and State of Washington, have invented certain new and useful Imrovements in Double-Exposure and Blankilm Preventing Devices forCameras, of which the following is a specification.

' expensive device of surface of .t e click My present invention relatesgenerally tocameras and more particularly to a double exposure and blankfilm preventing device, my object being the provlsion of a simple,positive device of this nature which may be readily applied to camerasnow in use as well as to those at the time of manufacture.

A further object is the provision of an inthis nature which will belasting and durable in use.-

In the accompanying drawings illustratin my present invention,

i re 1 is a side view of a camera provide with my improvements.

Fig. 2 is a front elevation,

Fig. 3 i a detail perspective view of the invention removed from thecamera, and- Fig. 4 is a plan view of a film constructed in accordancewith my invention as presently described.

Referring now to these figures and par .ticularly to Fig. 3 my inventionproposes an attachment for cameras including a flexible'shaft 10, whichpasses through a suitable flexiblesheath 11, the latter of which hasmetal tubes 12 at its opposite ends to facilitate its attachment to acamera.

In Figs. 1 and 2 I have shown'a camera of the folding rollfilm typesimply because of frequency of this type in use as compared sheath 11 issecured in u' right position upon" one side of the lens ho der 15 b anysuitable means as for instance by so dering the same in lace, and therespectivepm ecting end of t e flexible shaft v10 is suita ly se-'cured, as '1) similar means, to"'the' lower venient point.

, The other metal tube posure cannot be made.

lever 16 or vother con 12 is secured to the Specification of LettersPatent. Patented Dec. 20, 19 21. Application filed January 18,1920.Serial No. 351,141. I

casing 13 or other convenient point as clearly seen in Fig. 1, and therespective end of shaft 10 has a pyramidal shaped head 17, the axiof'which is disposed in alinement with one side edge of the roll film 18ssing from the feed roll 19 to the take-up roll 20.

As seen in Fig. 4 the roll film 18 includes the usual sensitized surface21 and a backing 22, one side edge of the latter of which extendsbeyondthe respectiveedge of the sensitized surface and is provided withnotches 23 at spaced points therealong, suf ficient in size to permit Ithe pyramidal shaped head 17 to pass freely through the same. Thesenotches 23 are preferably so spaced that they come into alinement with te head 17 before their respective film pressed downwardly to com lete anelxposure, the head 17 is force rearwardly past the edge of the rollfilm, the backing sheet 22 of the latter of which flexes for thispurpose, and engages the inner shoulder of the head so as to prevent itsforward movement. In this way the click lever 16 is locked in downwardposition after each exposure and until the film is turned to place afresh exposure space in effective position opposite the lens, it isobvious a second ex- Durin the advancing, movement of the film, a erexposure, one of its side notches'23 will be sh1fted into registry withthe head 17 'ust before a fresh exposure 5 ace of t e film reachesproper position or exposure, and. v

when one of the notches reaches the head 17 in this way, it is obviousthe head 17 will shift forwardly through the notch and the click lever16 will return to its upper position.

normal It wi be appreciated that the effect of 'the enga ement ofthehead 17 by. theedge of the ro l film after each exposure 15 positive andample to prevent the return of the click lever under its normalspring'action for its full return stroke so as to thus serve in itselfas a reminder to the user that the filmvshould be turned. At thesametime however a partial return stroke is permitted so that the inventiondoes not defeat the taking of either what are known as bulb pictures orthe completion of time exposures.

It is obvious that the invention may be adapted to various shutteractuating devices, for instance either bulb actuating means or what areknown as wire releases, the important consideration in any of thesedevices being the connection of one end of the shutter controlling wire10 so that the wire is moved when the shutter mechanism is actuated.

I claim:

1. In a film camera adapted to use a film having a-notched edge andhaving a shutter mechanism and an actuating means therefor, a filmengaging member connectthe shutter actuating means for engagement withthe edge of a film and releasable through the notches of the film edge.

2. In a film camera adapted to use a film having a notched edge andhaving a shutter mechanism and an actuating means therefor, a filmhaving a film engaging member connected to and movable by the shutteractuating means for engagement with the edge of a film and releasablethrough the notches of the film edge, said engaging member being in theform of a flexible wire connected at one end to the film actuating meansand having a shouldeged film engaging head at its opposite en 3. In afilm camera adapted to use a film having a notched edge and having ashutter mechanism and actuating means therefor, a film engaging memberof flexible 'form connected at one end to the shutter actuating meansand havinga shouldered head at its opposite end engageable with one edgeof a film and movable through the notches thereof, and a flexible sheaththrough which the said member extends, the ends of which sheath arerespectively connected to portions of the camera adjacent to the filmand to the shutter mechanism.

HOWARD Jormsolw rains.

